Four categories of people compared to pools of water:
1. those like a shallow pool which looks deep (those who are well mannered but who
don't know the Four Noble Truths);
2. Those like a deep pool which looks shallow (those who are bad mannered but who
know the Four Noble Truths);
3. Those like a shallow pool which looks shallow (those who are bad mannered and
don't know the Four Noble Truths), and;
4. Those like a deep pool which looks deep (those who are good mannered and know
the Four Noble Truths).